I'm not sure if this is realy necessary. I mean bitcoin is virtual digital currency and banknotes isn't something that bitcoin realy needs. Will this attract more users to bitcoin? I'm not so sure and I also don' think that idea like this would last for long.
+1 I think that people don't need a paper type BTC. Itself it came to reduce using banknotes. And there is another question: "Who will provide digital transactions when somebody pay with this banknotes?"